Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
(EJ2.0L 2.5L DOHC) Built for the Subaru Impreza... Obtaining the optimum cylinder head-to-block sealing is especially critical in small displacement engines employing high compression pistons or power adders like turbochargers, nitrous oxide and superchargers. That's why ARP head studs are popular among leading Sport Compact/Import racers.You should know that ARP uses a premium grade 8740 alloy that is rated far superior to aircraft quality. Then, each stud is precisely heat-treated to 200,000 psi. Following heattreat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It's important to note that lesser quality studs are not even centerless ground the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned something that won't happen with inferior quality head studs.ARP studs are thread rolled after heat-treat, which gives them about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat.You will also note that ARP offers specially undercut studs for several engines. This procedure (done only to the shorter studs) more equalizes the stretch of both studs, which makes for a more consistent clamping force one that compensates for head gasket compression when the head is installed. This helps prevent blown head gaskets, and assures optimum sealing!
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
Frequently Asked Questions
Q: What Subaru models are compatible with the ARP 2604701 Bolt Kit?A: The ARP 2604701 Bolt Kit is compatible with several Subaru models, specifically the 2.5L (1998-1999, 2004-2009, 2004-2008), 2.0L (2002-2005), and 2.2L (1999-2001) engines.
Q: What materials are used in the construction of the ARP Bolt Kit?A: The ARP Bolt Kit is constructed with premium grade 8740 alloy, which is known for its superior strength, as well as ARP2000® alloy, providing enhanced durability and performance.
Q: How does the thread rolling process benefit the ARP head studs?A: The thread rolling process used for ARP head studs occurs after heat treatment, which significantly increases fatigue strength, offering about 1000% better reliability compared to studs that are threaded before heat treatment.
Q: What manufacturing techniques ensure the precision of ARP head studs?A: ARP head studs are centerless ground for exceptional straightness and improved concentricity, ensuring that installation and alignment are easy and precise, which is critical for optimal sealing.
Q: How do undercut studs improve performance in the ARP Bolt Kit?A: The specially designed undercut studs in the ARP Bolt Kit help equalize the 'stretch' of both studs, providing a more consistent clamping force. This design prevents blown head gaskets and ensures optimum sealing for high-performance applications.
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